From info-volumizer-owner@els.sgi.com Mon Oct 3 08:56:54 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j93Fro2J8187366; Mon, 3 Oct 2005 08:53:50 -0700 (PDT) Received: from mscan1.ucar.edu (mscan1.ucar.edu [192.43.244.120]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j93F9RJT8164118 for ; Mon, 3 Oct 2005 08:09:29 -0700 (PDT) Received: from localhost (mscan1 [127.0.0.1]) by mscan1.ucar.edu (Postfix) with ESMTP id E06CD87E44 for ; Mon, 3 Oct 2005 09:09:25 -0600 (MDT) Received: from mscan1.ucar.edu ([127.0.0.1]) by localhost (mscan1.ucar.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 21799-10 for ; Mon, 3 Oct 2005 09:09:25 -0600 (MDT) Received: from mail.ucar.edu (mail.ucar.edu [128.117.64.220]) by mscan1.ucar.edu (Postfix) with ESMTP id C595F87E35 for ; Mon, 3 Oct 2005 09:09:25 -0600 (MDT) Received: from [128.117.220.121] (account alan HELO [128.117.220.121]) by mail.ucar.edu (CommuniGate Pro SMTP 4.2.7) with ESMTP id 4605379 for info-volumizer@els.sgi.com; Mon, 03 Oct 2005 09:09:25 -0600 Message-ID: <434149A4.2070504@ucar.edu> Date: Mon, 03 Oct 2005 09:09:24 -0600 From: Alan Norton User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20040910 X-Accept-Language: en-us, en MIME-Version: 1.0 To: "info-volumizer@els.sgi.com" Subject: [info-volumizer] Volumizer 2.9 regression with Quadro FX 1000 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: amavisd-new at ucar.edu Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com Praveen, We have found that Volumizer 2.9 consistently seg faults on a Quadro FX 1000 when we combine volume rendering with changing the color/opacity mapping. This is not a problem with Volumizer 2.8, although we did previously find problems with Volumizer 2.7 using this graphics card. There are unfortunately no unusual messages (using VOLUMIZER_DEBUG_LEVEL 5) before the crash. We are using 32-bit Red Hat Linux. -Alan From info-volumizer-owner@els.sgi.com Thu Oct 6 04:13:54 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j96BCWC67755002; Thu, 6 Oct 2005 04:12:32 -0700 (PDT) Received: from hastur.corp.sgi.com (hastur.corp.sgi.com [198.149.32.33]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j96B9tJT8229522 for ; Thu, 6 Oct 2005 04:09:55 -0700 (PDT) Received: from mtv-atc-013e--n.corp.sgi.com (mtv-atc-013e--n.corp.sgi.com [192.26.78.50]) by hastur.corp.sgi.com (8.12.9/8.12.10/SGI_generic_relay-1.2) with ESMTP id j96B9feS200202939 for ; Thu, 6 Oct 2005 04:09:41 -0700 (PDT) Received: from praveenlaptop (134.14.90.92 [134.14.90.92]) by mtv-atc-013e--n.corp.sgi.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2655.55) id 4D4ZBPT3; Thu, 6 Oct 2005 04:09:52 -0700 From: "Praveen Bhaniramka" To: Subject: RE: [info-volumizer] Volumizer 2.9 regression with Quadro FX 1000 Date: Thu, 6 Oct 2005 16:39:45 +0530 Message-ID: <000001c5ca66$7a4b3030$5c5a0e86@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: <434149A4.2070504@ucar.edu> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com Hi Alan, Sorry for the late reply. Is it possible for you to send us a test case so that we can reproduce this issue at our end? If you cannot share the source code, the binaries should do as well. Kindly also include details of the graphics driver version, data size/parameters, etc. I will file a bug internally for this issue and we will follow-up with you offline as and when we need more info or have updated software for you to check out. Thanks. Praveen > -----Original Message----- > From: owner-info-volumizer@els.sgi.com > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Alan Norton > Sent: Monday, October 03, 2005 8:39 PM > To: info-volumizer@els.sgi.com > Subject: [info-volumizer] Volumizer 2.9 regression with Quadro FX 1000 > > > Praveen, > We have found that Volumizer 2.9 consistently seg faults on a > Quadro FX > 1000 when we combine volume rendering with changing the color/opacity > mapping. This is not a problem with Volumizer 2.8, although we did > previously find problems with Volumizer 2.7 using this > graphics card. > There are unfortunately no unusual messages (using > VOLUMIZER_DEBUG_LEVEL > 5) before the crash. We are using 32-bit Red Hat Linux. > -Alan > From info-volumizer-owner@els.sgi.com Tue Oct 11 21:09:50 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9C48RWJ8335519; Tue, 11 Oct 2005 21:08:27 -0700 (PDT) Received: from smtp.nist.gov (rimp2.nist.gov [129.6.16.227]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9BKvxJT8353987 for ; Tue, 11 Oct 2005 13:57:59 -0700 (PDT) Received: from vail.cam.nist.gov (vail.cam.nist.gov [129.6.80.93]) by smtp.nist.gov (8.13.1/8.13.1) with ESMTP id j9BKvtcb030561; Tue, 11 Oct 2005 16:57:56 -0400 Received: from vail.cam.nist.gov (localhost [127.0.0.1]) by vail.cam.nist.gov (SGI-8.12.5/8.12.5) with ESMTP id j9BKvrAn665784; Tue, 11 Oct 2005 16:57:53 -0400 (EDT) Received: from localhost (steve@localhost) by vail.cam.nist.gov (SGI-8.12.5/8.12.5/Submit) with ESMTP id j9BKvrhW664639; Tue, 11 Oct 2005 16:57:53 -0400 (EDT) X-Authentication-Warning: vail.cam.nist.gov: steve owned process doing -bs Date: Tue, 11 Oct 2005 16:57:53 -0400 From: Steve Satterfield X-X-Sender: steve@vail.cam.nist.gov To: Volumizer Mailing List cc: Steve Satterfield Subject: [info-volumizer] DIVERSE BOF at VIS 2005 Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-NIST-MailScanner: Found to be clean X-NIST-MailScanner-From: steve@nist.gov Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com Birds of a Feather at VIS 2005 - DIVERSE - Flexible Open Source Software for Immersive Visualization Thursday, October 27, 6:15-7:45PM Hilton Minneapolis, Directors Row 4 DIVERSE is a cross-platform, open source, API for developing Virtual Environment (VE) applications that can run almost anywhere from laptops to multi-screen immersive environments. It has a highly flexible design which emphasizes reuse and reconfiguration of tools over recoding. DIVERSE provides: * a common user interface to interactive graphics and/or VE programs. Using DIVERSE the same program can be run on a CAVE(TM), ImmersaDesk(TM), HMD, desktop and laptop without modification. * a common API to VE oriented hardware such as trackers, wands, joysticks, and motion bases. * a "remote shared memory" facility that allows data from hardware or computation to be asynchronously shared between both local and remote processes DIVERSE is being used for scientific visualization, architectural and interior design walk-throughs, medical education and user interface design studies and other applications in both immersive and desktop environments. For information about DIVERSE see the web page- http://diverse.sourceforge.net For information about the VIS 2005 BOF contact: Steve Satterfield: steve@nist.gov John Kelso: kelso@nist.gov -Steve From info-volumizer-owner@els.sgi.com Tue Oct 18 11:06:32 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9II4qKB8500601; Tue, 18 Oct 2005 11:04:52 -0700 (PDT) Received: from theremin.irus.robarts.ca (theremin.irus.robarts.ca [198.20.40.10]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9IEqEJT8434254 for ; Tue, 18 Oct 2005 07:52:15 -0700 (PDT) Received: from crater.irus.robarts.ca (crater.irus.robarts.ca [198.20.36.38]) by theremin.irus.robarts.ca (8.12.10/8.12.10) with ESMTP id j9IEqD3k027202; Tue, 18 Oct 2005 10:52:13 -0400 (EDT) Date: Tue, 18 Oct 2005 10:52:13 -0400 (EDT) From: Kevin Wang X-X-Sender: kwang@crater.irus.robarts.ca To: Praveen Bhaniramka cc: info-volumizer@els.sgi.com Subject: [info-volumizer] Multiple Transfer functions for volumizer Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com Hi Praveen and list, I would like to use multiple transfer functions for volumizer. From the volumizer guide, it shows that one can assign a lookup table for certain shaders (LUT, Gradient, etc.) My question is how to download 2 lookup table to GPU and how to access them if I use GPU programming in volumizer. I see the technique using dependent texture for texture lookup table in the guide. I am guessing that this is the way done for the Altix since it uses ATI GPU. Thanks in advance, -- Kevin From info-volumizer-owner@els.sgi.com Tue Oct 18 11:50:52 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9IIo8hE8470584; Tue, 18 Oct 2005 11:50:08 -0700 (PDT) Received: from internal-mail-relay.corp.sgi.com (internal-mail-relay.corp.sgi.com [198.149.32.51]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9IIbPJT8474119 for ; Tue, 18 Oct 2005 11:37:25 -0700 (PDT) Received: from mtv-atc-013e--n.corp.sgi.com (mtv-atc-013e--n.corp.sgi.com [192.26.78.50]) by internal-mail-relay.corp.sgi.com (8.12.9/8.12.10/SGI_generic_relay-1.2) with ESMTP id j9IIbP2Z268617111 for ; Tue, 18 Oct 2005 11:37:25 -0700 (PDT) Received: from praveenlaptop (134.14.90.92 [134.14.90.92]) by mtv-atc-013e--n.corp.sgi.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2655.55) id VAPT89YA; Tue, 18 Oct 2005 11:37:23 -0700 From: "Praveen Bhaniramka" To: Subject: RE: [info-volumizer] Multiple Transfer functions for volumizer Date: Wed, 19 Oct 2005 00:07:14 +0530 Message-ID: <00bb01c5d412$fb404440$2e17fea9@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com Hi Kevin, Using multiple lookup tables with Volumizer is pretty trivial. For this you need to - 1. Specify the lookup tables in the corresponding shape's appearance using vzParameterLookupTable objects. 2. Specify the shader (GPU program) that uses the multiple lookup tables to do what you want them to do. On modern GPUs, lookup tables can be implemented using dependent texture lookups. If you are using the ARB_fragment_program extension to write your shaders (GPU program), you will also need to provide callback routines to bind these dependent textures on specific texture units. However, if you are using the ARB_fragment_shader/ARB_shading_language extensions (also known as the OpenGL Shading Language), the dependent texture setup is done by Volumizer transparently. You simply need to use them in your shader. Support for OpenGL Shading Language is available with Volumizer 2.9 release. The CustomShadeViewer example under /usr/share/Volumizer2/src/apps/simple/tmRenderAction directory demonstrates the use of multiple lookup tables. There are several example shaders under /usr/share/Volumizer2/src/shaders to help you get started with the shader part as well. Let us know if you have any further questions. Cheers, Praveen > -----Original Message----- > From: owner-info-volumizer@els.sgi.com > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang > Sent: Tuesday, October 18, 2005 8:22 PM > To: Praveen Bhaniramka > Cc: info-volumizer@els.sgi.com > Subject: [info-volumizer] Multiple Transfer functions for volumizer > > > Hi Praveen and list, > > I would like to use multiple transfer functions for > volumizer. From the > volumizer guide, it shows that one can assign a lookup table > for certain > shaders (LUT, Gradient, etc.) > > My question is how to download 2 lookup table to GPU and how > to access > them if I use GPU programming in volumizer. > > I see the technique using dependent texture for texture > lookup table in > the guide. I am guessing that this is the way done for the > Altix since it > uses ATI GPU. > > Thanks in advance, > > -- Kevin > From info-volumizer-owner@els.sgi.com Wed Oct 19 20:19:01 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9K3HFEE8047440; Wed, 19 Oct 2005 20:17:15 -0700 (PDT) Received: from qproxy.gmail.com (qproxy.gmail.com [72.14.204.201]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9JJpuJT7563524 for ; Wed, 19 Oct 2005 12:51:56 -0700 (PDT) Received: by qproxy.gmail.com with SMTP id q18so186859qba for ; Wed, 19 Oct 2005 12:51:55 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=YpKILGfLD/HCg6yE6gdMfTl1l17hSGtL6WmO+tg2RJ98mBzyuflgnDfyX3e02IFgOe1NBsAJ5zM0WMwFffgMGkVh4mqQBjcxzT1zTKq3LFIJhJkVcpfm2Xm1WgrBEWnv4NVtXteRm9xK1kM+5jGMP6ASpqvosbScRXUpDCLbqd0= Received: by 10.65.185.2 with SMTP id m2mr824307qbp; Wed, 19 Oct 2005 12:51:54 -0700 (PDT) Received: by 10.65.155.14 with HTTP; Wed, 19 Oct 2005 12:51:54 -0700 (PDT) Message-ID: Date: Wed, 19 Oct 2005 15:51:54 -0400 From: Kevin Wang To: info-volumizer@els.sgi.com, praveenb@sgi.com Subject: Re: [info-volumizer] Multiple Transfer functions for volumizer In-Reply-To: <00bb01c5d412$fb404440$2e17fea9@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_9956_8740564.1129751514284" References: <00bb01c5d412$fb404440$2e17fea9@asiapac.sgi.com> Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com ------=_Part_9956_8740564.1129751514284 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen, Thanks for your prompt response. I am experimenting it using ARB_fragment_shader extension now. For one volume using one LUT it works with my vtkVolumizerTextureMapper class. But once I add one more volume, it says "Linking GLSL program failed". here is my code for second volume as a texture for tagging. unsigned char * pointer2 =3D new unsigned char[dims2[0]*dims2[1]*dims2[2]]; ... here to initialize the volume // Create the volume texture vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture (dims, pointer2, textureType, format); //uses volume1' dims, textureType an= d format texture2->setGeometryROI(geometryROI); // volume1's geometry roi // Set the "volume" parameter for the appearance appearance->setParameter("volume2", texture2); texture2->unref(); then I get the following error when running it: Volumizer (4): Compile status: 1 Volumizer (4): Info Log: Volumizer (4): Link status: 0 Volumizer (4): Info Log: Fragment info ------------- (9) : error C3001: no program defined Volumizer Warning: Linking GLSL program 1 failed In my fragment program, i didnot use the second volume: static char FragmentShader[] =3D "void main(){\n" "vec4 color,color2,color3,color4;\n" "color =3D texture3D(volume,volume_TexCoord.stp);\n" "color4 =3D texture1D(lookup_table,color.x);\n" "gl_FragColor =3D color4;\n" "}"; Do you have any idea that can help me identify the problem? Another question is: can I use a 1D texture as a 3D texture for volumizer? Lastly I would like to know if it is ok to ran this kind of program (i.e. opengl + fragment_program ) under OpenGL Multipipe environment? We have a custom developed volume rendering program which uses fragment_program. I wonder if the OMP can help improve the performance. Thanks a lot, -- Kevin On 10/18/05, Praveen Bhaniramka wrote: > > Hi Kevin, > > Using multiple lookup tables with Volumizer is pretty trivial. For this > you need to - > > 1. Specify the lookup tables in the corresponding shape's appearance > using vzParameterLookupTable objects. > 2. Specify the shader (GPU program) that uses the multiple lookup tables > to do what you want them to do. > > On modern GPUs, lookup tables can be implemented using dependent texture > lookups. If you are using the ARB_fragment_program extension to write > your shaders (GPU program), you will also need to provide callback > routines to bind these dependent textures on specific texture units. > However, if you are using the ARB_fragment_shader/ARB_shading_language > extensions (also known as the OpenGL Shading Language), the dependent > texture setup is done by Volumizer transparently. You simply need to use > them in your shader. Support for OpenGL Shading Language is available > with Volumizer 2.9 release. > > The CustomShadeViewer example under > /usr/share/Volumizer2/src/apps/simple/tmRenderAction directory > demonstrates the use of multiple lookup tables. There are several > example shaders under /usr/share/Volumizer2/src/shaders to help you get > started with the shader part as well. > > Let us know if you have any further questions. > > Cheers, > Praveen > > > -----Original Message----- > > From: owner-info-volumizer@els.sgi.com > > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang > > Sent: Tuesday, October 18, 2005 8:22 PM > > To: Praveen Bhaniramka > > Cc: info-volumizer@els.sgi.com > > Subject: [info-volumizer] Multiple Transfer functions for volumizer > > > > > > Hi Praveen and list, > > > > I would like to use multiple transfer functions for > > volumizer. From the > > volumizer guide, it shows that one can assign a lookup table > > for certain > > shaders (LUT, Gradient, etc.) > > > > My question is how to download 2 lookup table to GPU and how > > to access > > them if I use GPU programming in volumizer. > > > > I see the technique using dependent texture for texture > > lookup table in > > the guide. I am guessing that this is the way done for the > > Altix since it > > uses ATI GPU. > > > > Thanks in advance, > > > > -- Kevin > > > > ------=_Part_9956_8740564.1129751514284 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen,

Thanks for your prompt response. I am experimenting it using ARB_fragment_shader extension now. For one volume using one LUT it works with my vtkVolumizerTextureMapper class. But once I add one more volume, it says "Linking GLSL program failed".

here is my code for second volume as a texture for tagging.

  unsigned char * pointer2 =3D new unsigned char[dims2[0]*dims2[1]*dim= s2[2]];
 
  ... here to initialize the volume

  // Create the volume texture
  vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture =
    (dims, pointer2, textureType, format); //uses volume1' d= ims, textureType and format
 
  texture2->setGeometryROI(geometryROI); // volume1's geometry ro= i
 
  // Set the "volume" parameter for the appearance
  appearance->setParameter("volume2", texture2);
  texture2->unref();

then I get the following error when running it:

Volumizer (4): Compile status: 1
Volumizer (4): Info Log:
Volumizer (4): Link status: 0
Volumizer (4): Info Log: Fragment info
-------------
(9) : error C3001: no program defined

Volumizer Warning:
Linking GLSL program 1 failed

In my fragment program, i didnot use the second volume:
static char FragmentShader[] =3D
"void main(){\n"
"vec4 color,color2,color3,color4;\n"
"color =3D texture3D(volume,volume_TexCoord.stp);\n"
"color4 =3D texture1D(lookup_table,color.x);\n"
"gl_FragColor =3D color4;\n"
"}";

Do you have any idea that can help me identify the problem?

Another question is: can I use a 1D texture as a 3D texture for volumizer? =

Lastly I would like to know if it is ok to ran this kind of program (i.e. opengl + fragment_program ) under OpenGL Multipipe environment? We have a custom developed volume rendering program which uses fragment_program. I wonder if the OMP can help improve the performance.

Thanks a lot,

-- Kevin

On 10/18/05, Praveen Bhaniramka <praveenb@sgi.com> wrote:
Hi Kevin,

Using multiple lookup tables with Volumizer is pretty triv= ial. For this
you need to -

1. Specify the lookup tables in the c= orresponding shape's appearance
using vzParameterLookupTable objects.
2. Specify the shader (GPU program) that uses the multiple lookup table= s
to do what you want them to do.

On modern GPUs, lookup tables c= an be implemented using dependent texture
lookups. If you are using the = ARB_fragment_program extension to write
your shaders (GPU program), you will also need to provide callback
r= outines to bind these dependent textures on specific texture units.
Howe= ver, if you are using the ARB_fragment_shader/ARB_shading_language
exten= sions (also known as the OpenGL Shading Language), the dependent
texture setup is done by Volumizer transparently. You simply need to us= e
them in your shader. Support for OpenGL Shading Language is available<= br>with Volumizer 2.9 release.

The CustomShadeViewer example under
/usr/share/Volumizer2/src/apps/simple/tmRenderAction directory
demon= strates the use of multiple lookup tables. There are several
example sha= ders under /usr/share/Volumizer2/src/shaders to help you get
started wit= h the shader part as well.

Let us know if you have any further questions.

Cheers,
Pr= aveen

> -----Original Message-----
> From: owner-info-volumizer@els.sgi.com > [mailto:owner-info= -volumizer@els.sgi.com] On Behalf Of Kevin Wang
> Sent: Tuesday, = October 18, 2005 8:22 PM
> To: Praveen Bhaniramka
> Cc: info-volumizer@els.sgi.com
> Subject: [info-volumizer] Multiple T= ransfer functions for volumizer
>
>
> Hi Praveen and list= ,
>
> I would like to use multiple transfer functions for
> volumizer. From the
> volumizer guide, it shows that one can ass= ign a lookup table
> for certain
> shaders (LUT, Gradient, etc.= )
>
> My question is how to download 2 lookup table to GPU and = how
> to access
> them if I use GPU programming in volumizer.
&= gt;
> I see the technique using dependent texture for texture
>= lookup table in
> the guide. I am guessing that this is the way done= for the
> Altix since it
> uses ATI GPU.
>
> Thanks in adv= ance,
>
> -- Kevin
>


------=_Part_9956_8740564.1129751514284-- From info-volumizer-owner@els.sgi.com Thu Oct 20 00:12:58 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9K7Bo2E8513624; Thu, 20 Oct 2005 00:11:50 -0700 (PDT) Received: from internal-mail-relay.corp.sgi.com (internal-mail-relay.corp.sgi.com [198.149.32.51]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9K72NJT1385783 for ; Thu, 20 Oct 2005 00:02:23 -0700 (PDT) Received: from mtv-atc-013e--n.corp.sgi.com (mtv-atc-013e--n.corp.sgi.com [192.26.78.50]) by internal-mail-relay.corp.sgi.com (8.12.9/8.12.10/SGI_generic_relay-1.2) with ESMTP id j9K72N2Z277840849 for ; Thu, 20 Oct 2005 00:02:23 -0700 (PDT) Received: from praveenlaptop (134.14.90.92 [134.14.90.92]) by mtv-atc-013e--n.corp.sgi.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2655.55) id VAPT9AYJ; Thu, 20 Oct 2005 00:02:20 -0700 From: "Praveen Bhaniramka" To: Subject: RE: [info-volumizer] Multiple Transfer functions for volumizer Date: Thu, 20 Oct 2005 12:32:08 +0530 Message-ID: <01c901c5d544$355b8590$2e17fea9@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01CA_01C5D572.4F13C190" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com This is a multi-part message in MIME format. ------=_NextPart_000_01CA_01C5D572.4F13C190 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hi Kevin, It is not clear what the issue is, but definitely it should be perfectly legal for you to not use the parameter "volume2" in the shader. Couple of quick tests - 1. Make sure that the system supports GLSL - "glxinfo | grep ARB_fragment_shader" should show the extension strings. 2. "setenv VOLUMIZER_DEBUG_LEVEL 5" before running the application. The shader string that the application passes to Volumizer is manipulated a little bit internally to make sure that the shader contains all the necessary parameters for the operations. Please look at the string and see if it shows anything obviously incorrect. (Feel free to send it my way and I can take a look as well). > Another question is: can I use a 1D texture as a 3D texture for volumizer? I am not sure what you mean by this, but I am guessing that you are trying to use a 1D texture as a vzParameterVolumeTexture? The minimal texture dimemsions that Volumizer supports is 4 currently, so if you use specify a texture with dimensions [n, 1, 1], Volumizer will zero pad it to [n, 4, 4] and then render it. However, this code path can sometimes be a little buggy so the best option would be for you to simply create a texture of size [n, 4, 4] before passing to Volumizer. A simple strategy for computing the new texture would be to replicate the 1D texture over the complete data. Hope that makes sense. I think that OMP should now support ARB_fragment_program extensions on Prism, but I honestly haven't tried this myself. Please give it a shot and if something does not work, let me know and pass the info along to the OMP team. Cheers, Praveen -----Original Message----- From: owner-info-volumizer@els.sgi.com [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang Sent: Thursday, October 20, 2005 1:22 AM To: info-volumizer@els.sgi.com; praveenb@sgi.com Subject: Re: [info-volumizer] Multiple Transfer functions for volumizer Hi Praveen, Thanks for your prompt response. I am experimenting it using ARB_fragment_shader extension now. For one volume using one LUT it works with my vtkVolumizerTextureMapper class. But once I add one more volume, it says "Linking GLSL program failed". here is my code for second volume as a texture for tagging. unsigned char * pointer2 = new unsigned char[dims2[0]*dims2[1]*dims2[2]]; ... here to initialize the volume // Create the volume texture vzParameterVolumeTexture *texture2 = new vzParameterVolumeTexture (dims, pointer2, textureType, format); //uses volume1' dims, textureType and format texture2->setGeometryROI(geometryROI); // volume1's geometry roi // Set the "volume" parameter for the appearance appearance->setParameter("volume2", texture2); texture2->unref(); then I get the following error when running it: Volumizer (4): Compile status: 1 Volumizer (4): Info Log: Volumizer (4): Link status: 0 Volumizer (4): Info Log: Fragment info ------------- (9) : error C3001: no program defined Volumizer Warning: Linking GLSL program 1 failed In my fragment program, i didnot use the second volume: static char FragmentShader[] = "void main(){\n" "vec4 color,color2,color3,color4;\n" "color = texture3D(volume,volume_TexCoord.stp);\n" "color4 = texture1D(lookup_table,color.x);\n" "gl_FragColor = color4;\n" "}"; Do you have any idea that can help me identify the problem? Another question is: can I use a 1D texture as a 3D texture for volumizer? Lastly I would like to know if it is ok to ran this kind of program (i.e. opengl + fragment_program ) under OpenGL Multipipe environment? We have a custom developed volume rendering program which uses fragment_program. I wonder if the OMP can help improve the performance. Thanks a lot, -- Kevin On 10/18/05, Praveen Bhaniramka wrote: Hi Kevin, Using multiple lookup tables with Volumizer is pretty trivial. For this you need to - 1. Specify the lookup tables in the corresponding shape's appearance using vzParameterLookupTable objects. 2. Specify the shader (GPU program) that uses the multiple lookup tables to do what you want them to do. On modern GPUs, lookup tables can be implemented using dependent texture lookups. If you are using the ARB_fragment_program extension to write your shaders (GPU program), you will also need to provide callback routines to bind these dependent textures on specific texture units. However, if you are using the ARB_fragment_shader/ARB_shading_language extensions (also known as the OpenGL Shading Language), the dependent texture setup is done by Volumizer transparently. You simply need to use them in your shader. Support for OpenGL Shading Language is available with Volumizer 2.9 release. The CustomShadeViewer example under /usr/share/Volumizer2/src/apps/simple/tmRenderAction directory demonstrates the use of multiple lookup tables. There are several example shaders under /usr/share/Volumizer2/src/shaders to help you get started with the shader part as well. Let us know if you have any further questions. Cheers, Praveen > -----Original Message----- > From: owner-info-volumizer@els.sgi.com > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang > Sent: Tuesday, October 18, 2005 8:22 PM > To: Praveen Bhaniramka > Cc: info-volumizer@els.sgi.com > Subject: [info-volumizer] Multiple Transfer functions for volumizer > > > Hi Praveen and list, > > I would like to use multiple transfer functions for > volumizer. From the > volumizer guide, it shows that one can assign a lookup table > for certain > shaders (LUT, Gradient, etc.) > > My question is how to download 2 lookup table to GPU and how > to access > them if I use GPU programming in volumizer. > > I see the technique using dependent texture for texture > lookup table in > the guide. I am guessing that this is the way done for the > Altix since it > uses ATI GPU. > > Thanks in advance, > > -- Kevin > ------=_NextPart_000_01CA_01C5D572.4F13C190 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Hi=20 Kevin,
 
It is = not clear what=20 the issue is, but definitely it should be perfectly legal = for you=20 to not use the parameter "volume2" in the shader. =
 
Couple = of quick=20 tests -
1. = Make sure that=20 the system supports GLSL - "glxinfo | grep ARB_fragment_shader" should = show the=20 extension strings.
2. = "setenv=20 VOLUMIZER_DEBUG_LEVEL 5" before running the application. The shader = string=20 that the application passes to Volumizer is manipulated a little = bit=20 internally to make sure that the shader contains all the necessary = parameters=20 for the operations. Please look at the string and see if it shows = anything=20 obviously incorrect. (Feel free to send it my way and I can take a look = as=20 well).
 
> Another question is: can I = use a 1D=20 texture as a 3D texture for volumizer?
 
I am not sure what you mean by this, but I am = guessing that=20 you are trying to use a 1D texture as a vzParameterVolumeTexture? The = minimal=20 texture dimemsions that Volumizer supports is 4 currently, so if you use = specify=20 a texture with dimensions [n, 1, 1], Volumizer will zero pad = it to [n,=20 4, 4] and then render it. However, this code path can sometimes be a = little=20 buggy so the best option would be for = you to simply=20 create a texture of size [n, 4, 4] before passing to Volumizer. A simple = strategy for computing the new texture would be to replicate the 1D=20 texture over the complete data. Hope that makes sense.=20
 
I think that OMP should now support = ARB_fragment_program=20 extensions on Prism, but I honestly haven't tried this myself. Please = give it a=20 shot and if something does not work, let me know and pass the info along = to the=20 OMP team.
 
Cheers,
Praveen
 
-----Original Message-----
From:=20 owner-info-volumizer@els.sgi.com = [mailto:owner-info-volumizer@els.sgi.com]=20 On Behalf Of Kevin Wang
Sent: Thursday, October 20, = 2005 1:22=20 AM
To: info-volumizer@els.sgi.com;=20 praveenb@sgi.com
Subject: Re: [info-volumizer] Multiple = Transfer=20 functions for volumizer

Hi Praveen,

Thanks = for your=20 prompt response. I am experimenting it using ARB_fragment_shader = extension=20 now. For one volume using one LUT it works with my = vtkVolumizerTextureMapper=20 class. But once I add one more volume, it says "Linking GLSL program=20 failed".

here is my code for second volume as a texture for=20 tagging.

  unsigned char * pointer2 =3D new unsigned=20 char[dims2[0]*dims2[1]*dims2[2]];
 
  ... here to = initialize=20 the volume

  // Create the volume texture
 =20 vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture=20
    (dims, pointer2, textureType, format); //uses = volume1'=20 dims, textureType and format
 
 =20 texture2->setGeometryROI(geometryROI); // volume1's geometry = roi
 =20
  // Set the "volume" parameter for the appearance
 =20 appearance->setParameter("volume2", texture2);
 =20 texture2->unref();

then I get the following error when = running=20 it:

Volumizer (4): Compile status: 1
Volumizer (4): Info=20 Log:
Volumizer (4): Link status: 0
Volumizer (4): Info Log: = Fragment=20 info
-------------
(9) : error C3001: no program=20 defined

Volumizer Warning:
Linking GLSL program 1 = failed

In=20 my fragment program, i didnot use the second volume:
static char=20 FragmentShader[] =3D
"void main(){\n"
"vec4=20 color,color2,color3,color4;\n"
"color =3D=20 texture3D(volume,volume_TexCoord.stp);\n"
"color4 =3D=20 texture1D(lookup_table,color.x);\n"
"gl_FragColor =3D=20 color4;\n"
"}";

Do you have any idea that can help me = identify the=20 problem?

Another question is: can I use a 1D texture as a 3D = texture=20 for volumizer?

Lastly I would like to know if it is ok to ran = this=20 kind of program (i.e. opengl + fragment_program ) under OpenGL = Multipipe=20 environment? We have a custom developed volume rendering program which = uses=20 fragment_program. I wonder if the OMP can help improve the=20 performance.

Thanks a lot,

-- Kevin

On 10/18/05, Praveen=20 Bhaniramka <praveenb@sgi.com>=20 wrote:
Hi=20 Kevin,

Using multiple lookup tables with Volumizer is pretty = trivial.=20 For this
you need to -

1. Specify the lookup tables in the = corresponding shape's appearance
using vzParameterLookupTable = objects.=20
2. Specify the shader (GPU program) that uses the multiple = lookup=20 tables
to do what you want them to do.

On modern GPUs, = lookup=20 tables can be implemented using dependent texture
lookups. If you = are=20 using the ARB_fragment_program extension to write
your shaders = (GPU=20 program), you will also need to provide callback
routines to bind = these=20 dependent textures on specific texture units.
However, if you are = using=20 the ARB_fragment_shader/ARB_shading_language
extensions (also = known as=20 the OpenGL Shading Language), the dependent
texture setup is = done by=20 Volumizer transparently. You simply need to use
them in your = shader.=20 Support for OpenGL Shading Language is available
with Volumizer = 2.9=20 release.

The CustomShadeViewer example under=20
/usr/share/Volumizer2/src/apps/simple/tmRenderAction=20 directory
demonstrates the use of multiple lookup tables. There = are=20 several
example shaders under /usr/share/Volumizer2/src/shaders = to help=20 you get
started with the shader part as well.

Let us know = if you=20 have any further questions.

Cheers,
Praveen

>=20 -----Original Message-----
> From: owner-info-volumizer@els= .sgi.com
>=20 [mailto:owner-info-volumizer@els= .sgi.com]=20 On Behalf Of Kevin Wang
> Sent: Tuesday, October 18, 2005 8:22 = PM
> To: Praveen Bhaniramka
> Cc: info-volumizer@els.sgi.com=
>=20 Subject: [info-volumizer] Multiple Transfer functions for=20 volumizer
>
>
> Hi Praveen and = list,
>
> I=20 would like to use multiple transfer functions for
> volumizer. = From=20 the
> volumizer guide, it shows that one can assign a lookup=20 table
> for certain
> shaders (LUT, Gradient,=20 etc.)
>
> My question is how to download 2 lookup table = to GPU=20 and how
> to access
> them if I use GPU programming in=20 volumizer.
>
> I see the technique using dependent = texture for=20 texture
> lookup table in
> the guide. I am guessing = that this=20 is the way done for the
> Altix since it
> uses ATI=20 GPU.
>
> Thanks in advance,
>
> --=20 = Kevin
>


------=_NextPart_000_01CA_01C5D572.4F13C190-- From info-volumizer-owner@els.sgi.com Thu Oct 20 21:55:53 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9L4sciJ8564478; Thu, 20 Oct 2005 21:54:38 -0700 (PDT) Received: from qproxy.gmail.com (qproxy.gmail.com [72.14.204.205]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9KGJoJT8478717 for ; Thu, 20 Oct 2005 09:19:51 -0700 (PDT) Received: by qproxy.gmail.com with SMTP id q18so140748qba for ; Thu, 20 Oct 2005 09:19:49 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=Ai7zmFPo9uNEzsxIWoNhFY5TeFRamyiFV3vf6EGxb2wxaKb/tCcTcFl27dA0q7c0F/GoKiYXvoBU8fEaWfmDrBgnaGrS6UfeRxhN2+seH6Cc+l6w8a05CNlEFq1nEzX2qxu/y5qEbY/Kmqfnf0Pj/cLYTU65/w/grGalWlbaDvg= Received: by 10.65.132.14 with SMTP id j14mr1611551qbn; Thu, 20 Oct 2005 09:19:49 -0700 (PDT) Received: by 10.65.155.14 with HTTP; Thu, 20 Oct 2005 09:19:49 -0700 (PDT) Message-ID: Date: Thu, 20 Oct 2005 12:19:49 -0400 From: Kevin Wang To: info-volumizer@els.sgi.com, praveenb@sgi.com Subject: Re: [info-volumizer] Multiple Transfer functions for volumizer In-Reply-To: <01c901c5d544$355b8590$2e17fea9@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_5059_15665927.1129825189267" References: <01c901c5d544$355b8590$2e17fea9@asiapac.sgi.com> Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com ------=_Part_5059_15665927.1129825189267 Content-Type: multipart/alternative; boundary="----=_Part_5060_29164103.1129825189267" ------=_Part_5060_29164103.1129825189267 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen, Thanks for your reply. I am attaching the debug output to you. One thing I noticed is that there is a strange character before " void main()" in my shading program. I am not sure if this is the reason. But when I use only one volume, there is no strange character in front of that. -- Kevin On 10/20/05, Praveen Bhaniramka wrote: > > Hi Kevin, > It is not clear what the issue is, but definitely it should be perfectly > legal for you to not use the parameter "volume2" in the shader. > Couple of quick tests - > 1. Make sure that the system supports GLSL - "glxinfo | grep > ARB_fragment_shader" should show the extension strings. > 2. "setenv VOLUMIZER_DEBUG_LEVEL 5" before running the application. The > shader string that the application passes to Volumizer is manipulated a > little bit internally to make sure that the shader contains all the > necessary parameters for the operations. Please look at the string and se= e > if it shows anything obviously incorrect. (Feel free to send it my way an= d I > can take a look as well). > > Another question is: can I use a 1D texture as a 3D texture for > volumizer? > I am not sure what you mean by this, but I am guessing that you are > trying to use a 1D texture as a vzParameterVolumeTexture? The minimal > texture dimemsions that Volumizer supports is 4 currently, so if you use > specify a texture with dimensions [n, 1, 1], Volumizer will zero pad it t= o > [n, 4, 4] and then render it. However, this code path can sometimes be a > little buggy so the best option would be for you to simply create a > texture of size [n, 4, 4] before passing to Volumizer. A simple strategy = for > computing the new texture would be to replicate the 1D texture over the > complete data. Hope that makes sense. > I think that OMP should now support ARB_fragment_program extensions on > Prism, but I honestly haven't tried this myself. Please give it a shot an= d > if something does not work, let me know and pass the info along to the OM= P > team. > Cheers, > Praveen > > -----Original Message----- > *From:* owner-info-volumizer@els.sgi.com [mailto: > owner-info-volumizer@els.sgi.com] *On Behalf Of *Kevin Wang > *Sent:* Thursday, October 20, 2005 1:22 AM > *To:* info-volumizer@els.sgi.com; praveenb@sgi.com > *Subject:* Re: [info-volumizer] Multiple Transfer functions for volumizer > > Hi Praveen, > > Thanks for your prompt response. I am experimenting it using > ARB_fragment_shader extension now. For one volume using one LUT it works > with my vtkVolumizerTextureMapper class. But once I add one more volume, = it > says "Linking GLSL program failed". > > here is my code for second volume as a texture for tagging. > > unsigned char * pointer2 =3D new unsigned char[dims2[0]*dims2[1]*dims2[2]= ]; > > ... here to initialize the volume > > // Create the volume texture > vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture > (dims, pointer2, textureType, format); //uses volume1' dims, textureType > and format > > texture2->setGeometryROI(geometryROI); // volume1's geometry roi > > // Set the "volume" parameter for the appearance > appearance->setParameter("volume2", texture2); > texture2->unref(); > > then I get the following error when running it: > > Volumizer (4): Compile status: 1 > Volumizer (4): Info Log: > Volumizer (4): Link status: 0 > Volumizer (4): Info Log: Fragment info > ------------- > (9) : error C3001: no program defined > > Volumizer Warning: > Linking GLSL program 1 failed > > In my fragment program, i didnot use the second volume: > static char FragmentShader[] =3D > "void main(){\n" > "vec4 color,color2,color3,color4;\n" > "color =3D texture3D(volume,volume_TexCoord.stp);\n" > "color4 =3D texture1D(lookup_table,color.x);\n" > "gl_FragColor =3D color4;\n" > "}"; > > Do you have any idea that can help me identify the problem? > > Another question is: can I use a 1D texture as a 3D texture for volumizer= ? > > > Lastly I would like to know if it is ok to ran this kind of program (i.e. > opengl + fragment_program ) under OpenGL Multipipe environment? We have a > custom developed volume rendering program which uses fragment_program. I > wonder if the OMP can help improve the performance. > > Thanks a lot, > > -- Kevin > > On 10/18/05, Praveen Bhaniramka wrote: > > > > Hi Kevin, > > > > Using multiple lookup tables with Volumizer is pretty trivial. For this > > you need to - > > > > 1. Specify the lookup tables in the corresponding shape's appearance > > using vzParameterLookupTable objects. > > 2. Specify the shader (GPU program) that uses the multiple lookup table= s > > to do what you want them to do. > > > > On modern GPUs, lookup tables can be implemented using dependent textur= e > > lookups. If you are using the ARB_fragment_program extension to write > > your shaders (GPU program), you will also need to provide callback > > routines to bind these dependent textures on specific texture units. > > However, if you are using the ARB_fragment_shader/ARB_shading_language > > extensions (also known as the OpenGL Shading Language), the dependent > > texture setup is done by Volumizer transparently. You simply need to us= e > > them in your shader. Support for OpenGL Shading Language is available > > with Volumizer 2.9 release. > > > > The CustomShadeViewer example under > > /usr/share/Volumizer2/src/apps/simple/tmRenderAction directory > > demonstrates the use of multiple lookup tables. There are several > > example shaders under /usr/share/Volumizer2/src/shaders to help you get > > started with the shader part as well. > > > > Let us know if you have any further questions. > > > > Cheers, > > Praveen > > > > > -----Original Message----- > > > From: owner-info-volumizer@els.sgi.com > > > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang > > > Sent: Tuesday, October 18, 2005 8:22 PM > > > To: Praveen Bhaniramka > > > Cc: info-volumizer@els.sgi.com > > > Subject: [info-volumizer] Multiple Transfer functions for volumizer > > > > > > > > > Hi Praveen and list, > > > > > > I would like to use multiple transfer functions for > > > volumizer. From the > > > volumizer guide, it shows that one can assign a lookup table > > > for certain > > > shaders (LUT, Gradient, etc.) > > > > > > My question is how to download 2 lookup table to GPU and how > > > to access > > > them if I use GPU programming in volumizer. > > > > > > I see the technique using dependent texture for texture > > > lookup table in > > > the guide. I am guessing that this is the way done for the > > > Altix since it > > > uses ATI GPU. > > > > > > Thanks in advance, > > > > > > -- Kevin > > > > > > > > ------=_Part_5060_29164103.1129825189267 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen,

Thanks for your reply. I am attaching the debug output to you. One thing I noticed is that there is a strange character before " void main()" in my shading program. I am not sure if this is the reason. Bu= t when I use only one volume, there is no strange character in front of that.

-- Kevin

On 10/20/05, Praveen Bhaniramka <praveenb@sgi.com> wrote:
Hi=20 Kevin,
 
It is not clear what=20 the issue is, but definitely it should be perfectly legal for you= =20 to not use the parameter "volume2" in the shader.
 
Couple of quick=20 tests -
1. Make sure that=20 the system supports GLSL - "glxinfo | grep ARB_fragment_shader" s= hould show the=20 extension strings.
2. "setenv=20 VOLUMIZER_DEBUG_LEVEL 5" before running the application. The shader st= ring=20 that the application passes to Volumizer is manipulated a little bit= =20 internally to make sure that the shader contains all the necessary paramete= rs=20 for the operations. Please look at the string and see if it shows anything= =20 obviously incorrect. (Feel free to send it my way and I can take a look as= =20 well).
 
> Another question is: can I use a 1D=20 texture as a 3D texture for volumizer?
 = ;
I am not sure what you mea= n by this, but I am guessing that=20 you are trying to use a 1D texture as a vzParameterVolumeTexture? The minim= al=20 texture dimemsions that Volumizer supports is 4 currently, so if you use sp= ecify=20 a texture with dimensions [n, 1, 1], Volumizer will zero pad it t= o [n,=20 4, 4] and then render it. However, this code path can sometimes be a little= =20 buggy so the best option would be for you to simply=20 create a texture of size [n, 4, 4] before passing to Volumizer. A simple=20 strategy for computing the new texture would be to replicate the 1D=20 texture over the complete data. Hope that makes sense.=20
 = ;
I think that OMP should no= w support ARB_fragment_program=20 extensions on Prism, but I honestly haven't tried this myself. Please give = it a=20 shot and if something does not work, let me know and pass the info along to= the=20 OMP team.
 = ;
Cheers,
Praveen
 = ;
-----Original Message-----
From:=20 owner-info-volumizer@= els.sgi.com [mailto: owner-info-volumizer@els.sgi.com]=20 On Behalf Of Kevin Wang
Sent: Thu= rsday, October 20, 2005 1:22=20 AM
To: info-volum= izer@els.sgi.com;=20 praveenb@sgi.com
Subject: Re: [info-volumizer] Multiple Transfer=20 functions for volumizer

Hi Praveen,

Thanks for your=20 prompt response. I am experimenting it using ARB_fragment_shader extensio= n=20 now. For one volume using one LUT it works with my vtkVolumizerTextureMap= per=20 class. But once I add one more volume, it says "Linking GLSL program= =20 failed".

here is my code for second volume as a texture for= =20 tagging.

  unsigned char * pointer2 =3D new unsigned=20 char[dims2[0]*dims2[1]*dims2[2]];
 
  ... here to initia= lize=20 the volume

  // Create the volume texture
 =20 vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture=20
    (dims, pointer2, textureType, format); //uses volu= me1'=20 dims, textureType and format
 
 =20 texture2->setGeometryROI(geometryROI); // volume1's geometry roi
&n= bsp;=20
  // Set the "volume" parameter for the appearance
=  =20 appearance->setParameter("volume2", texture2);
 =20 texture2->unref();

then I get the following error when running= =20 it:

Volumizer (4): Compile status: 1
Volumizer (4): Info=20 Log:
Volumizer (4): Link status: 0
Volumizer (4): Info Log: Fragmen= t=20 info
-------------
(9) : error C3001: no program=20 defined

Volumizer Warning:
Linking GLSL program 1 failed
In=20 my fragment program, i didnot use the second volume:
static char=20 FragmentShader[] =3D
"void main(){\n"
"vec4=20 color,color2,color3,color4;\n"
"color =3D=20 texture3D(volume,volume_TexCoord.stp);\n"
"color4 =3D=20 texture1D(lookup_table,color.x);\n"
"gl_FragColor =3D=20 color4;\n"
"}";

Do you have any idea that can he= lp me identify the=20 problem?

Another question is: can I use a 1D texture as a 3D text= ure=20 for volumizer?

Lastly I would like to know if it is ok to ran thi= s=20 kind of program (i.e. opengl + fragment_program ) under OpenGL Multipipe= =20 environment? We have a custom developed volume rendering program which us= es=20 fragment_program. I wonder if the OMP can help improve the=20 performance.

Thanks a lot,

-- Kevin

On 10/18/05, Praveen=20 Bhaniramka <praveenb@sgi.com>=20 wrote:
Hi=20 Kevin,

Using multiple lookup tables with Volumizer is pretty tri= vial.=20 For this
you need to -

1. Specify the lookup tables in the=20 corresponding shape's appearance
using vzParameterLookupTable object= s.=20
2. Specify the shader (GPU program) that uses the multiple lookup= =20 tables
to do what you want them to do.

On modern GPUs, lookup= =20 tables can be implemented using dependent texture
lookups. If you ar= e=20 using the ARB_fragment_program extension to write
your shaders (GPU= =20 program), you will also need to provide callback
routines to bind th= ese=20 dependent textures on specific texture units.
However, if you are us= ing=20 the ARB_fragment_shader/ARB_shading_language
extensions (also known = as=20 the OpenGL Shading Language), the dependent
texture setup is done b= y=20 Volumizer transparently. You simply need to use
them in your shader.= =20 Support for OpenGL Shading Language is available
with Volumizer 2.9= =20 release.

The CustomShadeViewer example under=20
/usr/share/Volumizer2/src/apps/simple/tmRenderAction=20 directory
demonstrates the use of multiple lookup tables. There are= =20 several
example shaders under /usr/share/Volumizer2/src/shaders to h= elp=20 you get
started with the shader part as well.

Let us know if= you=20 have any further questions.

Cheers,
Praveen

>=20 -----Original Message-----
> From: owner-info-volumizer@els.sgi.com
>=20 [mailto:owner-info-= volumizer@els.sgi.com]=20 On Behalf Of Kevin Wang
> Sent: Tuesday, October 18, 2005 8:22=20 PM
> To: Praveen Bhaniramka
> Cc: info-volumizer@els.sgi.com
>=20 Subject: [info-volumizer] Multiple Transfer functions for=20 volumizer
>
>
> Hi Praveen and list,
>
> = I=20 would like to use multiple transfer functions for
> volumizer. Fr= om=20 the
> volumizer guide, it shows that one can assign a lookup=20 table
> for certain
> shaders (LUT, Gradient,=20 etc.)
>
> My question is how to download 2 lookup table to = GPU=20 and how
> to access
> them if I use GPU programming in=20 volumizer.
>
> I see the technique using dependent texture = for=20 texture
> lookup table in
> the guide. I am guessing that t= his=20 is the way done for the
> Altix since it
> uses ATI=20 GPU.
>
> Thanks in advance,
>
> --=20 Kevin
>



------=_Part_5060_29164103.1129825189267-- ------=_Part_5059_15665927.1129825189267 Content-Type: text/plain; name=VolumizerDebug.txt; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="VolumizerDebug.txt" [kwang@polygon examples]$ python tkvolumizer.py sbrain.mnc Initializing debug Level to: 5 Volumizer (3): =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D Volumizer (3): Checking for 'volumizer_linux' license Volumizer (1): =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D Volumizer (1): =3D OpenGL Volumizer 2.9 =3D Volumizer (1): =3D FULL EDITION =3D Volumizer (1): =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D Volumizer (4): Object 85d2010 ref() -> Ref count =3D 2 Volumizer (4): Object 85d2010 unref() -> Ref count =3D 1 Data dimensions =3D 64, 64, 64 Volumizer (1): Texture type =3D VZ_UNSIGNED_BYTE Volumizer (1): Number of Components =3D 1 Volumizer (4): Object 85d2198 ref() -> Ref count =3D 2 Volumizer (4): Object 85d2198 unref() -> Ref count =3D 1 Volumizer (4): Object 85d22c0 ref() -> Ref count =3D 2 Volumizer (4): Object 85d22c0 unref() -> Ref count =3D 1 Volumizer (4): Object 85d33f0 ref() -> Ref count =3D 2 Volumizer (4): Object 85d33f0 unref() -> Ref count =3D 1 Volumizer (4): Object 85d1e48 ref() -> Ref count =3D 2 Volumizer (4): Object 85d20e8 ref() -> Ref count =3D 2 Volumizer (4): Object 85d1e48 unref() -> Ref count =3D 1 Volumizer (4): Object 85d20e8 unref() -> Ref count =3D 1 Volumizer (5): Client attribute stack maximum depth =3D 16 Volumizer (4): Vendor string =3D NVIDIA Corporation Volumizer (4): Renderer string =3D GeForce FX Go5200 32M/64M/AGP/SSE2 Volumizer (2): GeForce FX graphics Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ARBImaging =3D yes Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ARBFragmentProgram =3D yes Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ARBVertexProgram =3D yes Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ARBFragmentShader =3D yes Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ARBVertexShader =3D yes Volumizer (5): vzPlatformInfo::vzPlatformInfo(): ATIFragmentShader =3D no Volumizer (5): vzPlatformInfo::vzPlatformInfo(): SGITextureColorTable =3D n= o Volumizer (5): vzPlatformInfo::vzPlatformInfo(): SGIColorMatrix =3D no Volumizer (3): ARBFragmentProgram::init(): GL_ARB_fragment_program supporte= d Volumizer (3): ARBFragmentShader::init(): GL_ARB_fragment_shader supported Volumizer (3): vzRenderAction::manage : Number of shapes currently managed = =3D 0 Volumizer (3): Shape 85d34d0 has 2 volume textures Volumizer (3): Total size for all the textures =3D 524288, maximum texture = memory =3D 134217728 Volumizer (4): Object 85d34d0 ref() -> Ref count =3D 2 Volumizer (4): Object 85d20e8 ref() -> Ref count =3D 2 Volumizer (4): Object 85d33f0 ref() -> Ref count =3D 2 Volumizer (4): Object 85d2010 ref() -> Ref count =3D 2 Volumizer (5): Number of parameters =3D 3 Volumizer (5): Generated Fragment Shader string =3D uniform sampler1D lookup_table; vec4 lookup_table_TexCoord =3D gl_TexCoord[0]; vec4 volume_TexCoord =3D gl_TexCoord[1]; uniform sampler3D volume; uniform vec3 volume_TexDims; vec4 volume2_TexCoord =3D gl_TexCoord[2]; uniform sampler3D volume2; uniform vec3 volume2_TexDims; =1B%G=C3=AF=C2=BF=C2=BD=1B%@void main(){ vec4 color,color2,color3,color4; color =3D texture3D(volume,volume_TexCoord.stp); //color2 =3D texture3D(volume2,volume2_TexCoord.stp); color4 =3D texture1D(lookup_table,color.x); gl_FragColor =3D color4; } Volumizer (5): TMInternalGPUShaderImpl::initShader(): Generated fragment sh= ader 1 Volumizer (5): This works fine after binding the shader Volumizer (4): Compile status: 1 Volumizer (4): Info Log: Volumizer (4): Link status: 0 Volumizer (4): Info Log: Fragment info ------------- (9) : error C3001: no program defined Volumizer Warning: Linking GLSL program 1 failed Volumizer (5): TMGeneralShader::initialize(): Generated fragment shader 1 Volumizer (4): Object 85d2198 ref() -> Ref count =3D 2 Volumizer (4): Object 85d22c0 ref() -> Ref count =3D 2 Volumizer (5): Pixelstore settings: SKIP_PIXELS: 0, SKIP_ROWS: 0, SKIP_IMAG= ES: 0, ROW_LENGTH: 64, IMAGE_HEIGHT: 64 Volumizer (5): glTexImage3D called for (64 x 64 x 64) texture (loading into= (64 x 64 x 64) texture), data ptr =3D b36b7008, ID =3D 1 Volumizer (5): Pixelstore settings: SKIP_PIXELS: 0, SKIP_ROWS: 0, SKIP_IMAG= ES: 0, ROW_LENGTH: 64, IMAGE_HEIGHT: 64 Volumizer (5): glTexImage3D called for (64 x 64 x 64) texture (loading into= (64 x 64 x 64) texture), data ptr =3D b36b7008, ID =3D 2 Volumizer (5): vzTMRenderAction: Total texture memory consumed: 524288 Volumizer (5): TMGeneralShader::bindParameter(): Number of parameters =3D 3 Volumizer Warning: ARBFragmentShader::bindVolumeTexture(): Location -1 returned for lookup_tab= le Volumizer Warning: ARBFragmentShader::bindVolumeTexture(): Location -1 returned for volume Volumizer Warning: ARBFragmentShader::bindVolumeTexture(): Location -1 returned for volume2 Volumizer (4): Object 85d1e48 ref() -> Ref count =3D 2 Volumizer (4): Object 85dc088 ref() -> Ref count =3D 2 Volumizer (4): Object 85dc008 ref() -> Ref count =3D 2 Volumizer (4): Object 85dc008 unref() -> Ref count =3D 1 Volumizer (4): Object 85dc088 unref() -> Ref count =3D 1 Volumizer (3): Computing adjacency list... Volumizer (4): Object 8bfec20 ref() -> Ref count =3D 2 Volumizer (4): Object 8bfec20 unref() -> Ref count =3D 1 ------=_Part_5059_15665927.1129825189267-- From info-volumizer-owner@els.sgi.com Thu Oct 20 21:55:53 2005 Received: (from majordom@localhost) by els.sgi.com (8.12.10/8.12.2/els-2.2) id j9L4t9ho8489933; Thu, 20 Oct 2005 21:55:09 -0700 (PDT) Received: from qproxy.gmail.com (qproxy.gmail.com [72.14.204.201]) by els.sgi.com (8.12.10/8.12.2/els-2.2) with ESMTP id j9KLBvJT8514784 for ; Thu, 20 Oct 2005 14:11:58 -0700 (PDT) Received: by qproxy.gmail.com with SMTP id q18so203700qba for ; Thu, 20 Oct 2005 14:11:56 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=OnIZn/gl9IA0GuuEPwsgLFgVeQr6nKJyRtUk96GIQwRvKMBblgfiDnR0uk+j51iaUgp/LYYMz296bF0gXANnSf1TopK11MKJjQW9zocTPnaAhzDJ/kyF11pc6H43OZeTStNtBID2JBDX8TIF7OQA7e/nANkozSURL71V1+4/zpQ= Received: by 10.65.148.15 with SMTP id a15mr1812543qbo; Thu, 20 Oct 2005 14:11:56 -0700 (PDT) Received: by 10.65.155.14 with HTTP; Thu, 20 Oct 2005 14:11:56 -0700 (PDT) Message-ID: Date: Thu, 20 Oct 2005 17:11:56 -0400 From: Kevin Wang To: info-volumizer@els.sgi.com Subject: Re: [info-volumizer] Multiple Transfer functions for volumizer In-Reply-To: <01c901c5d544$355b8590$2e17fea9@asiapac.sgi.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_10336_32850051.1129842716375" References: <01c901c5d544$355b8590$2e17fea9@asiapac.sgi.com> Sender: owner-info-volumizer@els.sgi.com Precedence: bulk Reply-To: info-volumizer@els.sgi.com ------=_Part_10336_32850051.1129842716375 Content-Type: multipart/alternative; boundary="----=_Part_10337_6188013.1129842716375" ------=_Part_10337_6188013.1129842716375 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen, Fortunately after I add second lookup table to the shader, the problem goes way. I think the problem is related to the shader string. Although I am not sure what it exactly is. Now I have another question. If I use a second volume as the tagging volume as the TagShader does in Volumizer, if the second volume dimensions are sam= e as the first, then the volume shows up correctly. but if my second volume dimensions are not same as the first, let say the first is 128*128*128 and the second is 8*8*8, then the volume shows up like subsampling using the second volume even though I did not use any value from the texture sampling of volume2. The reason I want different dimension on second volume is that I want to keep it small so I can dynamically change the tagging area and download thi= s volume to GPU. Otherwise the downloading will be a pain. below is the shader program, you can see that I do not use the result from the second volume: static char FragmentShader[] =3D "void main(){\n" "vec4 color,color2,color3,color4,color5;\n" "color =3D texture3D(volume,volume_TexCoord.stp);\n" "color2 =3D texture3D(volume1,volume1_TexCoord.stp);\n" "color4 =3D texture1D(lookup_table,color.x);\n" "color5 =3D texture1D(lookup_table2,color2.x);\n" "gl_FragColor =3D color4;\n" "}"; I also attached the pictures using full resolution and subsampled resultion of second volume. -- Kevin On 10/20/05, Praveen Bhaniramka wrote: > > Hi Kevin, > It is not clear what the issue is, but definitely it should be perfectly > legal for you to not use the parameter "volume2" in the shader. > Couple of quick tests - > 1. Make sure that the system supports GLSL - "glxinfo | grep > ARB_fragment_shader" should show the extension strings. > 2. "setenv VOLUMIZER_DEBUG_LEVEL 5" before running the application. The > shader string that the application passes to Volumizer is manipulated a > little bit internally to make sure that the shader contains all the > necessary parameters for the operations. Please look at the string and se= e > if it shows anything obviously incorrect. (Feel free to send it my way an= d I > can take a look as well). > > Another question is: can I use a 1D texture as a 3D texture for > volumizer? > I am not sure what you mean by this, but I am guessing that you are > trying to use a 1D texture as a vzParameterVolumeTexture? The minimal > texture dimemsions that Volumizer supports is 4 currently, so if you use > specify a texture with dimensions [n, 1, 1], Volumizer will zero pad it t= o > [n, 4, 4] and then render it. However, this code path can sometimes be a > little buggy so the best option would be for you to simply create a > texture of size [n, 4, 4] before passing to Volumizer. A simple strategy = for > computing the new texture would be to replicate the 1D texture over the > complete data. Hope that makes sense. > I think that OMP should now support ARB_fragment_program extensions on > Prism, but I honestly haven't tried this myself. Please give it a shot an= d > if something does not work, let me know and pass the info along to the OM= P > team. > Cheers, > Praveen > > -----Original Message----- > *From:* owner-info-volumizer@els.sgi.com [mailto: > owner-info-volumizer@els.sgi.com] *On Behalf Of *Kevin Wang > *Sent:* Thursday, October 20, 2005 1:22 AM > *To:* info-volumizer@els.sgi.com; praveenb@sgi.com > *Subject:* Re: [info-volumizer] Multiple Transfer functions for volumizer > > Hi Praveen, > > Thanks for your prompt response. I am experimenting it using > ARB_fragment_shader extension now. For one volume using one LUT it works > with my vtkVolumizerTextureMapper class. But once I add one more volume, = it > says "Linking GLSL program failed". > > here is my code for second volume as a texture for tagging. > > unsigned char * pointer2 =3D new unsigned char[dims2[0]*dims2[1]*dims2[2]= ]; > > ... here to initialize the volume > > // Create the volume texture > vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture > (dims, pointer2, textureType, format); //uses volume1' dims, textureType > and format > > texture2->setGeometryROI(geometryROI); // volume1's geometry roi > > // Set the "volume" parameter for the appearance > appearance->setParameter("volume2", texture2); > texture2->unref(); > > then I get the following error when running it: > > Volumizer (4): Compile status: 1 > Volumizer (4): Info Log: > Volumizer (4): Link status: 0 > Volumizer (4): Info Log: Fragment info > ------------- > (9) : error C3001: no program defined > > Volumizer Warning: > Linking GLSL program 1 failed > > In my fragment program, i didnot use the second volume: > static char FragmentShader[] =3D > "void main(){\n" > "vec4 color,color2,color3,color4;\n" > "color =3D texture3D(volume,volume_TexCoord.stp);\n" > "color4 =3D texture1D(lookup_table,color.x);\n" > "gl_FragColor =3D color4;\n" > "}"; > > Do you have any idea that can help me identify the problem? > > Another question is: can I use a 1D texture as a 3D texture for volumizer= ? > > > Lastly I would like to know if it is ok to ran this kind of program (i.e. > opengl + fragment_program ) under OpenGL Multipipe environment? We have a > custom developed volume rendering program which uses fragment_program. I > wonder if the OMP can help improve the performance. > > Thanks a lot, > > -- Kevin > > On 10/18/05, Praveen Bhaniramka wrote: > > > > Hi Kevin, > > > > Using multiple lookup tables with Volumizer is pretty trivial. For this > > you need to - > > > > 1. Specify the lookup tables in the corresponding shape's appearance > > using vzParameterLookupTable objects. > > 2. Specify the shader (GPU program) that uses the multiple lookup table= s > > to do what you want them to do. > > > > On modern GPUs, lookup tables can be implemented using dependent textur= e > > lookups. If you are using the ARB_fragment_program extension to write > > your shaders (GPU program), you will also need to provide callback > > routines to bind these dependent textures on specific texture units. > > However, if you are using the ARB_fragment_shader/ARB_shading_language > > extensions (also known as the OpenGL Shading Language), the dependent > > texture setup is done by Volumizer transparently. You simply need to us= e > > them in your shader. Support for OpenGL Shading Language is available > > with Volumizer 2.9 release. > > > > The CustomShadeViewer example under > > /usr/share/Volumizer2/src/apps/simple/tmRenderAction directory > > demonstrates the use of multiple lookup tables. There are several > > example shaders under /usr/share/Volumizer2/src/shaders to help you get > > started with the shader part as well. > > > > Let us know if you have any further questions. > > > > Cheers, > > Praveen > > > > > -----Original Message----- > > > From: owner-info-volumizer@els.sgi.com > > > [mailto:owner-info-volumizer@els.sgi.com] On Behalf Of Kevin Wang > > > Sent: Tuesday, October 18, 2005 8:22 PM > > > To: Praveen Bhaniramka > > > Cc: info-volumizer@els.sgi.com > > > Subject: [info-volumizer] Multiple Transfer functions for volumizer > > > > > > > > > Hi Praveen and list, > > > > > > I would like to use multiple transfer functions for > > > volumizer. From the > > > volumizer guide, it shows that one can assign a lookup table > > > for certain > > > shaders (LUT, Gradient, etc.) > > > > > > My question is how to download 2 lookup table to GPU and how > > > to access > > > them if I use GPU programming in volumizer. > > > > > > I see the technique using dependent texture for texture > > > lookup table in > > > the guide. I am guessing that this is the way done for the > > > Altix since it > > > uses ATI GPU. > > > > > > Thanks in advance, > > > > > > -- Kevin > > > > > > > > ------=_Part_10337_6188013.1129842716375 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Praveen,

Fortunately after I add second lookup table to the shader, the problem goes way. I think the problem is related to the shader string. Although I am not sure what it exactly is.

Now I have another question. If I use a second volume as the tagging volume as the TagShader does in Volumizer, if the second volume dimensions are same as the first, then the volume shows up correctly. but if my second volume dimensions are not same as the first, let say the first is 128*128*128 and the second is 8*8*8, then the volume shows up like subsampling using the second volume even though I did not use any value from the texture sampling of volume2.

The reason I want different dimension on second volume is that I want to keep it small so I can dynamically change the tagging area and download this volume to GPU. Otherwise the downloading will be a pain.

below is the shader program, you can see that I do not use the result from = the second volume:
static char FragmentShader[] =3D
"void main(){\n"
"vec4 color,color2,color3,color4,color5;\n"
"color =3D texture3D(volume,volume_TexCoord.stp);\n"
"color2 =3D texture3D(volume1,volume1_TexCoord.stp);\n"
"color4 =3D texture1D(lookup_table,color.x);\n"
"color5 =3D texture1D(lookup_table2,color2.x);\n"
"gl_FragColor =3D color4;\n"
"}";

I also attached the pictures using full resolution and subsampled resultion= of second volume.

-- Kevin

On 10/20/05, Praveen Bhaniramka <praveen= b@sgi.com> wrote:
Hi=20 Kevin,
 
It is not clear what=20 the issue is, but definitely it should be perfectly legal for you= =20 to not use the parameter "volume2" in the shader.
 
Couple of quick=20 tests -
1. Make sure that=20 the system supports GLSL - "glxinfo | grep ARB_fragment_shader" s= hould show the=20 extension strings.
2. "setenv=20 VOLUMIZER_DEBUG_LEVEL 5" before running the application. The shader st= ring=20 that the application passes to Volumizer is manipulated a little bit= =20 internally to make sure that the shader contains all the necessary paramete= rs=20 for the operations. Please look at the string and see if it shows anything= =20 obviously incorrect. (Feel free to send it my way and I can take a look as= =20 well).
 
> Another question is: can I use a 1D=20 texture as a 3D texture for volumizer?
 = ;
I am not sure what you mea= n by this, but I am guessing that=20 you are trying to use a 1D texture as a vzParameterVolumeTexture? The minim= al=20 texture dimemsions that Volumizer supports is 4 currently, so if you use sp= ecify=20 a texture with dimensions [n, 1, 1], Volumizer will zero pad it t= o [n,=20 4, 4] and then render it. However, this code path can sometimes be a little= =20 buggy so the best option would be for you to simply=20 create a texture of size [n, 4, 4] before passing to Volumizer. A simple=20 strategy for computing the new texture would be to replicate the 1D=20 texture over the complete data. Hope that makes sense.=20
 = ;
I think that OMP should no= w support ARB_fragment_program=20 extensions on Prism, but I honestly haven't tried this myself. Please give = it a=20 shot and if something does not work, let me know and pass the info along to= the=20 OMP team.
 = ;
Cheers,
Praveen
 = ;
-----Original Message-----
From:=20 owner-info-volumizer@= els.sgi.com [mailto: owner-info-volumizer@els.sgi.com]=20 On Behalf Of Kevin Wang
Sent: Thursday, October 20, 2005 1:22=20 AM
To: info-volum= izer@els.sgi.com;=20 praveenb@sgi.com
Subject: Re: [info-volumizer] Multiple Transfer=20 functions for volumizer

Hi Praveen,

Thanks for your=20 prompt response. I am experimenting it using ARB_fragment_shader extensio= n=20 now. For one volume using one LUT it works with my vtkVolumizerTextureMap= per=20 class. But once I add one more volume, it says "Linking GLSL program= =20 failed".

here is my code for second volume as a texture for= =20 tagging.

  unsigned char * pointer2 =3D new unsigned=20 char[dims2[0]*dims2[1]*dims2[2]];
 
  ... here to initia= lize=20 the volume

  // Create the volume texture
 =20 vzParameterVolumeTexture *texture2 =3D new vzParameterVolumeTexture=20
    (dims, pointer2, textureType, format); //uses volu= me1'=20 dims, textureType and format
 
 =20 texture2->setGeometryROI(geometryROI); // volume1's geometry roi
&n= bsp;=20
  // Set the "volume" parameter for the appearance
=  =20 appearance->setParameter("volume2", texture2);
 =20 texture2->unref();

then I get the following error when running= =20 it:

Volumizer (4): Compile status: 1
Volumizer (4): Info=20 Log:
Volumizer (4): Link status: 0
Volumizer (4): Info Log: Fragmen= t=20 info
-------------
(9) : error C3001: no program=20 defined

Volumizer Warning:
Linking GLSL program 1 failed
In=20 my fragment program, i didnot use the second volume:
static char=20 FragmentShader[] =3D
"void main(){\n"
"vec4=20 color,color2,color3,color4;\n"
"color =3D=20 texture3D(volume,volume_TexCoord.stp);\n"
"color4 =3D=20 texture1D(lookup_table,color.x);\n"
"gl_FragColor =3D=20 color4;\n"
"}";

Do you have any idea that can he= lp me identify the=20 problem?

Another question is: can I use a 1D texture as a 3D text= ure=20 for volumizer?

Lastly I would like to know if it is ok to ran thi= s=20 kind of program (i.e. opengl + fragment_program ) under OpenGL Multipipe= =20 environment? We have a custom developed volume rendering program which us= es=20 fragment_program. I wonder if the OMP can help improve the=20 performance.

Thanks a lot,

-- Kevin

On 10/18/05, Praveen=20 Bhaniramka <praveenb@sgi.com>=20 wrote:
Hi=20 Kevin,

Using multiple lookup tables with Volumizer is pretty tri= vial.=20 For this
you need to -

1. Specify the lookup tables in the=20 corresponding shape's appearance
using vzParameterLookupTable object= s.=20
2. Specify the shader (GPU program) that uses the multiple lookup= =20 tables
to do what you want them to do.

On modern GPUs, lookup= =20 tables can be implemented using dependent texture
lookups. If you ar= e=20 using the ARB_fragment_program extension to write
your shaders (GPU= =20 program), you will also need to provide callback
routines to bind th= ese=20 dependent textures on specific texture units.
However, if you are us= ing=20 the ARB_fragment_shader/ARB_shading_language
extensions (also known = as=20 the OpenGL Shading Language), the dependent
texture setup is done b= y=20 Volumizer transparently. You simply need to use
them in your shader.= =20 Support for OpenGL Shading Language is available
with Volumizer 2.9= =20 release.

The CustomShadeViewer example under=20
/usr/share/Volumizer2/src/apps/simple/tmRenderAction=20 directory
demonstrates the use of multiple lookup tables. There are= =20 several
example shaders under /usr/share/Volumizer2/src/shaders to h= elp=20 you get
started with the shader part as well.

Let us know if= you=20 have any further questions.

Cheers,
Praveen

>=20 -----Original Message-----
> From: owner-info-volumizer@els.sgi.com
>=20 [mailto:owner-info-= volumizer@els.sgi.com]=20 On Behalf Of Kevin Wang
> Sent: Tuesday, October 18, 2005 8:22=20 PM
> To: Praveen Bhaniramka
> Cc: info-volumizer@els.sgi.com
>=20 Subject: [info-volumizer] Multiple Transfer functions for=20 volumizer
>
>
> Hi Praveen and list,
>
> = I=20 would like to use multiple transfer functions for
> volumizer. Fr= om=20 the
> volumizer guide, it shows that one can assign a lookup=20 table
> for certain
> shaders (LUT, Gradient,=20 etc.)
>
> My question is how to download 2 lookup table to = GPU=20 and how
> to access
> them if I use GPU programming in=20 volumizer.
>
> I see the technique using dependent texture = for=20 texture
> lookup table in
> the guide. I am guessing that t= his=20 is the way done for the
> Altix since it
> uses ATI=20 GPU.
>
> Thanks in advance,
>
> --=20 Kevin
>



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